Search teams recovered a 13th body Saturday from the snow and ice covering a dangerous climbing pass on Mount Everest, where an avalanche a day earlier swept over a group of Sherpa guides in the deadliest disaster on the world's highest peak.

Another three guides remained missing, and searchers were working quickly to find them in case weather conditions deteriorated, said Maddhu Sunan Burlakoti, head of the Nepalese government's mountaineering department. The painstaking effort, however, involves testing the strength of newly fallen snow and using extra clamps, ropes and aluminum ladders to navigate the treacherous Khumbu icefall, a maze of immense ice chunks and crevasses.

The avalanche slammed into the guides about 6:30 a.m. Friday near the "popcorn field," a section of the Khumbu. The group of about 25 Sherpa guides were among the first people making their way up the mountain this climbing season. They were hauling gear to the higher camps that their foreign clients would use in attempting to reach the summit next month.

The snow slide hit at an elevation near 19,000 feet. The area is considered particularly dangerous due to its steep slope and deep crevasses that cut through the snow and ice covering the pass year round.

Seven of the 12 bodies pulled out and brought down Friday were handed over to their families in the Everest region, while the other five were taken to Kathmandu, Nepal's capital.

Four survivors were conscious and being treated in the intensive care units of several Kathmandu hospitals for broken ribs, fractured limbs, punctured lungs and skin abrasions, according to Dr. C.R. Pandey from Grande Hospital. Others were treated for less serious injuries at the Everest base camp.